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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flows provided by operating activities:      
Net income $ 203,319 $ 148,514 $ 131,411
Adjustments to reconcile net income to net cash provided by operating activities:      
Share-based compensation 12,688 12,276 11,257
Provision for bad debts 18,478 18,639 16,620
Depreciation and amortization 54,228 45,683 35,675
Deferred income taxes (5,160) 8,432 4,576
Other, including fixed asset impairments 3,883 1,161 3,713
Changes in assets and liabilities:      
Accounts receivable (19,848) (20,598) (17,139)
Prepaid expenses and other (2,399) (1,715) (2,525)
Accounts payable 5,378 (4,793) 5,002
Accrued liabilities 3,079 6,743 (5,500)
Income taxes receivable/payable 16,048 11,892 (4,965)
Deferred rent (369) (475) (1,211)
Deferred revenue 6,156 2,863 1,008
Student deposits 9,417 9,139 7,158
Net cash provided by operating activities 304,898 237,761 185,080
Cash flows used in investing activities:      
Capital expenditures (113,586) (178,292) (204,718)
Purchases of land, building and golf course improvements related to off-site development (10,368) (60,727) (13,583)
Proceeds received from note receivable   501  
Return of equity method investment 685 1,749  
Purchases of investments (94,054) (49,157) (48,122)
Proceeds from sale or maturity of investments 65,259 69,925 65,542
Net cash used in investing activities (152,064) (216,001) (200,881)
Cash flows (used in) provided by financing activities:      
Principal payments on notes payable and capital lease obligations (6,805) (7,224) (6,784)
Debt issuance costs   (194)  
Net borrowings from revolving line of credit (25,000) 25,000  
Repurchase of common shares including shares withheld in lieu of income taxes (11,300) (20,062) (15,562)
Net proceeds from exercise of stock options 7,372 13,207 3,489
Net cash (used in) provided by financing activities (35,733) 10,727 (18,857)
Net increase (decrease) in cash and cash equivalents and restricted cash 117,101 32,487 (34,658)
Cash and cash equivalents and restricted cash, beginning of period 130,907 98,420 133,078
Cash and cash equivalents and restricted cash, end of period 248,008 130,907 98,420
Supplemental disclosure of cash flow information      
Cash paid during the year for interest 2,252 1,220 1,244
Cash paid during the year for income taxes 69,606 66,206 75,587
Supplemental disclosure of non-cash investing and financing activities      
Purchases of property and equipment included in accounts payable $ 6,682 7,746 13,277
Purchases of equipment though capital lease obligations     1,156
Shortfall tax expense from share-based compensation   260 26
Tax benefit of Spirit warrant intangible   $ 253 $ 253